How do you implement Login via OTP for Customers at the storefront?

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Hi, I'm an indie developer, currently trying to set up a Shopify store for a client. 

One of their requirement is to have an OTP-based login for their customers at the storefront.

By any chance, does an app for SMS-based OTP login exist on Shopify App Store? If not, any inputs about it's implementation would be extremely helpful